x86: consolidate header guards

This patch is the result of an automatic script that consolidates the
format of all the headers in include/asm-x86/.

The format:

1. No leading underscore. Names with leading underscores are reserved.
2. Pathname components are separated by two underscores. So we can
   distinguish between mm_types.h and mm/types.h.
3. Everything except letters and numbers are turned into single
   underscores.

Signed-off-by: Vegard Nossum <vegard.nossum@gmail.com>
diff --git a/include/asm-x86/ds.h b/include/asm-x86/ds.h
index 7881368..6b27c68 100644
--- a/include/asm-x86/ds.h
+++ b/include/asm-x86/ds.h
@@ -17,8 +17,8 @@
  * Markus Metzger <markus.t.metzger@intel.com>, Dec 2007
  */
 
-#ifndef _ASM_X86_DS_H
-#define _ASM_X86_DS_H
+#ifndef ASM_X86__DS_H
+#define ASM_X86__DS_H
 
 #include <linux/types.h>
 #include <linux/init.h>
@@ -69,4 +69,4 @@
 extern unsigned long ds_debugctl_mask(void);
 extern void __cpuinit ds_init_intel(struct cpuinfo_x86 *c);
 
-#endif /* _ASM_X86_DS_H */
+#endif /* ASM_X86__DS_H */